Got an error while submitting a new sales invoice from both POS and sales invoice Doctype

I am getting an error while creating a new sales invoice from both POS and sales invoice. So I cannot create any sales invoice at this moment.

Traceback (most recent call last):
File “/home/tinvento/frappe-bench/apps/frappe/frappe/desk/form/”, line 19, in savedocs
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 856, in submit
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 845, in _submit
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 259, in save
return self._save(*args, **kwargs)
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 282, in _save
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 248, in insert
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 918, in run_post_save_methods
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 780, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/tinvento/frappe-bench/apps/frappe/frappe/model/”, line 1055, in composer
File “/home/tinvento/frappe-bench/apps/frappe/frappe/”, line 1017, in get_attr
return getattr(get_module(modulename), methodname)
File “/home/tinvento/frappe-bench/apps/frappe/frappe/”, line 798, in get_module
return importlib.import_module(modulename)
File “/home/tinvento/frappe-bench/env/lib/python3.5/importlib/”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 986, in _gcd_import
File “”, line 969, in _find_and_load
File “”, line 958, in _find_and_load_unlocked
File “”, line 673, in _load_unlocked
File “”, line 697, in exec_module
File “”, line 222, in _call_with_frames_removed
File “/home/tinvento/frappe-bench/apps/erpnext/erpnext/regional/italy/”, line 7, in
from frappe.utils.file_manager import save_file, remove_file
ImportError: No module named ‘frappe.utils.file_manager’